PROLOG | NAME | SYNOPSIS | DESCRIPTION | RETURN VALUE | ERRORS | EXAMPLES | APPLICATION USAGE | RATIONALE | FUTURE DIRECTIONS | SEE ALSO | COPYRIGHT

ISWCTYPE(3P)              POSIX Programmer's Manual             ISWCTYPE(3P)

PROLOG         top

       This manual page is part of the POSIX Programmer's Manual.  The Linux
       implementation of this interface may differ (consult the
       corresponding Linux manual page for details of Linux behavior), or
       the interface may not be implemented on Linux.

NAME         top

       iswctype, iswctype_l — test character for a specified class

SYNOPSIS         top

       #include <wctype.h>

       int iswctype(wint_t wc, wctype_t charclass);
       int iswctype_l(wint_t wc, wctype_t charclass,
           locale_t locale);

DESCRIPTION         top

       For iswctype(): The functionality described on this reference page is
       aligned with the ISO C standard. Any conflict between the
       requirements described here and the ISO C standard is unintentional.
       This volume of POSIX.1‐2008 defers to the ISO C standard.

       The iswctype() and iswctype_l() functions shall determine whether the
       wide-character code wc has the character class charclass, returning
       true or false. The iswctype() and iswctype_l() functions are defined
       on WEOF and wide-character codes corresponding to the valid character
       encodings in the current locale, or in the locale represented by
       locale, respectively. If the wc argument is not in the domain of the
       function, the result is undefined.  If the value of charclass is
       invalid (that is, not obtained by a call to wctype() or charclass is
       invalidated by a subsequent call to setlocale() that has affected
       category LC_CTYPE) the result is unspecified.

       The behavior is undefined if the locale argument to iswctype_l() is
       the special locale object LC_GLOBAL_LOCALE or is not a valid locale
       object handle.

RETURN VALUE         top

       The iswctype() and iswctype_l() functions shall return non-zero
       (true) if and only if wc has the property described by charclass.  If
       charclass is 0, these functions shall return 0.

ERRORS         top

       No errors are defined.

       The following sections are informative.

EXAMPLES         top

   Testing for a Valid Character
           #include <wctype.h>
           ...
           int yes_or_no;
           wint_t wc;
           wctype_t valid_class;
           ...
           if ((valid_class=wctype("vowel")) == (wctype_t)0)
               /* Invalid character class. */
           yes_or_no=iswctype(wc,valid_class);

APPLICATION USAGE         top

       The twelve strings "alnum", "alpha", "blank", "cntrl", "digit",
       "graph", "lower", "print", "punct", "space", "upper", and "xdigit"
       are reserved for the standard character classes. In the table below,
       the functions in the left column are equivalent to the functions in
       the right column.

           iswalnum(wc)            iswctype(wc, wctype("alnum"))
           iswalnum_l(wc, locale)  iswctype_l(wc, wctype("alnum"), locale)
           iswalpha(wc)            iswctype(wc, wctype("alpha"))
           iswalpha_l(wc, locale)  iswctype_l(wc, wctype("alpha"), locale)
           iswblank(wc)            iswctype(wc, wctype("blank"))
           iswblank_l(wc, locale)  iswctype_l(wc, wctype("blank"), locale)
           iswcntrl(wc)            iswctype(wc, wctype("cntrl"))
           iswcntrl_l(wc, locale)  iswctype_l(wc, wctype("cntrl"), locale)
           iswdigit(wc)            iswctype(wc, wctype("digit"))
           iswdigit_l(wc, locale)  iswctype_l(wc, wctype("digit"), locale)
           iswgraph(wc)            iswctype(wc, wctype("graph"))
           iswgraph_l(wc, locale)  iswctype_l(wc, wctype("graph"), locale)
           iswlower(wc)            iswctype(wc, wctype("lower"))
           iswlower_l(wc, locale)  iswctype_l(wc, wctype("lower"), locale)
           iswprint(wc)            iswctype(wc, wctype("print"))
           iswprint_l(wc, locale)  iswctype_l(wc, wctype("print"), locale)
           iswpunct(wc)            iswctype(wc, wctype("punct"))
           iswpunct_l(wc, locale)  iswctype_l(wc, wctype("punct"), locale)
           iswspace(wc)            iswctype(wc, wctype("space"))
           iswspace_l(wc, locale)  iswctype_l(wc, wctype("space"), locale)
           iswupper(wc)            iswctype(wc, wctype("upper"))
           iswupper_l(wc, locale)  iswctype_l(wc, wctype("upper"), locale)
           iswxdigit(wc)           iswctype(wc, wctype("xdigit"))
           iswxdigit_l(wc, locale) iswctype_l(wc, wctype("xdigit"), locale)

RATIONALE         top

       None.

FUTURE DIRECTIONS         top

       None.

SEE ALSO         top

       iswalnum(3p), iswalpha(3p), iswcntrl(3p), iswdigit(3p), iswgraph(3p),
       iswlower(3p), iswprint(3p), iswpunct(3p), iswspace(3p), iswupper(3p),
       iswxdigit(3p), setlocale(3p), uselocale(3p), wctype(3p)

       The Base Definitions volume of POSIX.1‐2008, locale.h(0p),
       wctype.h(0p)

COPYRIGHT         top

       Portions of this text are reprinted and reproduced in electronic form
       from IEEE Std 1003.1, 2013 Edition, Standard for Information
       Technology -- Portable Operating System Interface (POSIX), The Open
       Group Base Specifications Issue 7, Copyright (C) 2013 by the
       Institute of Electrical and Electronics Engineers, Inc and The Open
       Group.  (This is POSIX.1-2008 with the 2013 Technical Corrigendum 1
       applied.) In the event of any discrepancy between this version and
       the original IEEE and The Open Group Standard, the original IEEE and
       The Open Group Standard is the referee document. The original
       Standard can be obtained online at http://www.unix.org/online.html .

       Any typographical or formatting errors that appear in this page are
       most likely to have been introduced during the conversion of the
       source files to man page format. To report such errors, see
       https://www.kernel.org/doc/man-pages/reporting_bugs.html .

IEEE/The Open Group                 2013                        ISWCTYPE(3P)

Pages that refer to this page: wchar.h(0p)wctype.h(0p)iswalnum(3p)iswalpha(3p)iswblank(3p)iswcntrl(3p)iswdigit(3p)iswgraph(3p)iswlower(3p)iswprint(3p)iswpunct(3p)iswspace(3p)iswupper(3p)iswxdigit(3p)setlocale(3p)wctype(3p)